Knockoff for electric warp stop motion



De.16,1941. o. v. PAYNE, 2,266,474

KNOCKOFF FOR` ELECTRIC WARP STOE MOTION Filed July 11, 1939 Invenbov 05cm* V. Pa ne Attorney Patented Dec. 16V, 1941 OFFICEv KNooKorr Fonu ELECTRIC WARP STOP.

- MOTIONv Y 'Oscar V. rayne, Leicester, Mass., assignor to Crompton 8; KnwlesLoom Works, Worcester,

Mass., a corporation of Massachusetts Application-July 11, 1939, Serial N0. 283,858

9 Claims. 139336) This invention relates to improvements in elec-l tric warp stop motions for looms and it is the general object of the invention'to provide an improved electro-magnetically operated knocking-olf mechanism. 1

Warp stop motions generally operate with a series of light weight drop wires mounted on the warp threads ink such a way that breakage or slackness of the threads will permit thek associated drop wire to fall. In electrical warp stop motions the descentrof the drop wire closes an electric circuitl containing electro-magnetic devices which act to stop the loom. l

The circuit as used under modern .conditions is supplied with power by a transformer vhaving a primary winding connected to the power line during loom operation and having a secondary winding which supplies power for the stopping circuit, and a solenoid. The electric circuit therefore includes three separate and stationary windings, and a core specially constructed for an alternating magnetic eld has been necessary. It is an important object of my presentinvention to eliminate the previously used solenoid and its movable core, and secure the necessary motion to initiate loom ystoppage by separating the two coils of the transformer and mounting them .for relative motionwith respect to each other.

It is a furtherv object of my present invention to locate a movable coil in a magnetic field' and provide 'for closing a circuit including the" coil when the loom is to be stopped tofdevelopran induced current in the coil which vwill setzzup .a counter-ma-gnetic field resulting inmotion ofthe coil relatively to the primary magnetic field. I have chosen to illustrate this feature of -my invention by mounting the movable coil around a mass of magnetizable material in which an alternating magnetic eld is set up by a magnetizing coil. The movable or induction coil liesV in the pathof the rising and falling lines of magnetic force and has generated in it'an `electro-motive force, so'that closure of `a circuit including the induction coil by some such device-as a drop wire will cause an' inducedV current toI flow through the induction coil and thereby set up'a magnetic iield which tries-to move away from the primary field and in doing so 'produces a motion of the induction coil which 'can be utilized to initiate loom stoppage. `I do not wish, however, to be limited to the particular'form of the invention Ato be describedhereinafter, inasmuch as it is sufiicient if falling of the drop wire or the like results in the `production .ofopposed magnetic fields the effect of which is to cause motion of a controlling part of the loom.

In my prior Patent No. 1,873,465 I have shown an electrically vcontrolled knock-off mechanism A including aregularly oscillating lever and a force prior patent, except for the omission of the solenoid,A and make provision for moving the force transmitter into the path of the actuator lever Whenever the induction coil is moved.

With these and other objects in View as the description proceeds, my invention resides in the combination and arrangement'of parts hereinafter ,described and set forth.

In the accompanying drawing, wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a side elevation of a part of a loom having my invention applied thereto,

Fig. 2 is an enlarged viewiof a portion of Fig. 1 with the drop wire shownvdiagrammaticallyand the parts in running position in full lines and in stopping position in dotted lines, and

Fig. 3 isa horizontal section on line 3--3Fof Fig. 2. Y

The loom Yto which my invention can be applied comprises a frame I0 on which is mounted a driving motor II geared to top shaft I2 by means of pinion' I3 and gear I4. The latter meshes` with va second gear I5 having twice the number' of teethv of gear I4 to turn thebottom shaft I6 once for every` second revolution of the top shaft I2. A cam I'I secured to the bottom shaft causes rising and falling of a knock-off lever I8 which is pivoted as at I9 to a`plate 20 secured to theloomside in any approved manner and on which the knock-off mechanism is mounted. An arm 2| is pivoted as at 22 to the plate 20 and is connected by means of a rod 23 to a conventionally shown shipper handle 24 on the shipper shaft 25. A force transmitter 26 is pivoted as at 21 to the arm 2I and has a reduced end 28 for engagement with a lug29'on the lever I8. A dog 30 is`pivoted as at 3l to the plate 20 and is normally held in the full line position of Fig2 by a shoulder 32`on the transmitterZ'I.

4 When in the full line position shown in Fig. 2 the lever I8 rocks back and forth during loom operation and the lug 29 passes over the reduced end 28 of the transmitter, hence the latter remains at rest and the arm 2l, rod 23 and the shipper handle 24 remain stationary. When the transmitter 26 is raised in a manner to be set forth hereinafter to the dotted line position of Fig. 2 a finger 35 on the dog moves to the left under the t-ransmitter 25 to hold the latter in its elevated position. The left end 30 of the dog may lbe counter-weighted to insure rocking thereof. On the next oscillation of lever I8 to the left the lug will engage reduced end-23 land move the transmitter 26 to the left, thereby rock-` ing the arm 2| to move the shipper handle to stopping position by a force transmittedv through rod 23.

The drop wire 46 which I prefer to employV has a slot 4I in the upper end thereof through `which extends the contact bar designated generally at 42. trode 43 insulated from the outer grounded electrode 44. The latter has a protruding rib 45 which cooperates with one of the bosses 46 of the drop wire. The other boss is adapted for engagement with the insulated electrode '43. When a warp thread W is intact the `drop wire is supported in the full line position shown in Fig. 2 and the bosses 46 are unable to connect the electrodes 43 and 44 electrically. When the warp thread slackens or breaks, however, the drop wire falls to the dotted line position shown in Fig. 2, thereby electrically connecting the electrodes.

The knock-off mechanism may be the same as that set forth in my aforesaid patent to lwhich reference may be had for a further description,

and the drop wire and contact bar 42 may be the same as that shown in my prior Patents Nos. 1,852,217 and 1,873,466.

In carrying my present invention into Veffect I provide a magnetic body 50 formed with a series of laminations I as suggested in Fig. 3 and held to the plate by bolts 52. The magnetic body 50 has right and left side bars 53 and 54', respectively, between which extends' any intermediate bar 55 preferably parallel to and equally spaced from the bars 53 and 54. The bars already described may be magnetically connected together by horizontal top and bottom cross bars 56' and 51, respectively. The magnetic body 50 provides a closed circuit for any magnetism which maybe developed in the intermediate or central bari55.

I provide a normally energized coil 60 which is fixed to the upper part of the intermediate ybar 55 and is connected by wires 6| and 62 to a source of electric power through a switch S. As shown in Fig. 1 the switch S has three poles for the three wires of a three phase electric circuit, while the wires Gland 62 are connected to two of the three wires whenever the switch S is closed. It is not thought necessary to give further description of the relation between the switch S and the coil 60 and reference may be had to my prior Patent No. 1,873,147 for additional description of the manner in which an electric warp stopmotion knock-ofi can be energized from a threephase circuit.

Below the coil 60 and surrounding the intermediate bar 55 is a movable or floating induction coil 65 which is connected to the wires 41 and 48. 'Ihis coil is supported by the two arms 66 of aY yoked lever 61 pivoted as at 68 for-convenience to the magnetic body l50. A link "69 connects the left end of lever` 61- to theorce transmitter 26. as at 10. A counter-weight '11.

This bar includes an inner plate or elecmovable to adjusted position on the transmitter 26 provides means for counter-balancing the weight of the movable coil. Under normal conditions the weight of the transmitter 26 and the counter-Weight 1| is sufficient to lift the right ends of the arms 66 to the full line position of Fig. 2 and therefore hold the coil 65 in a position adjacent to the energized or actuating coil 60.

In operation, normal running of the loom with the warp threads in proper condition will leave the parts in the full line position shown in Fig. 2.

' The constantly energized coil 60 creates an alternating eld of magneticA force which induces an electro-motive force in the induction coil 65. When one `of the-warp threads breaks or becomes Yslackened the'drop wire corresponding thereto falls'A to connect wires 41 and 43, thereby establis'hingaclosed circuit through the movable coil 65. I nd that when these conditions exist the coil 65 isA repelled from the energized coil 60, thereby depressing the arms 66 and causingV the connected parts to move to thedotted line position in Fig. 2` to effect loom stoppage. The alternating magnetic field set `up in the intermediate bar 55 by the coil 60 is believed t'oinduce acurrent in coil 65 when the wires 41 and'48 are connected lto create a magnetic field around the movable coil 65 which is. repelled'by the `field created by the actuator coilV 66.

From the `foregoing it will be seen that' Ihave provided a simplified stoppingcrcuit for an lelectric warp stop motion which eliminates `theusually employed solenoid and its, movableA core. The usual transformer as such isomitted, although I use twosets of windings similar to those found on the transformer, butV` one lof the windings is mounted so that it can be' moved by magnetic repulsion derived fromy the other winding. '.By eliminating the solenoid I reduce. the tendency of lthe stopping circuit to producesparks at the contact bar.

Having thus described kmy invention it will be seen that. 'changes and:v modifications Amay. .be made therein bythose'skill'ed in the art without departing from, the spirit and scope of the invention and I'do rnotwishxtoA be limitedtothe details herein-disclosed,` but` what Iclaim is:

1. Ina knock-ofi' mechanisrn'for a, loom stop motion, a regularly moving actuator, a. knockoff lever to be rockedv to-.stop.the,loom. aforce transmitter normallyout of force transmittingY position relativelyto the actuator .andy lever. a single electric fcoil. normally. energizedk to crea-te an alternating' magnetic field, a second Aelectric coilnormally-"stationary .and capable of movement in the-magneticeld, said second coil-being located within the :fieldV of the-rst namedcoil a normally openl electric ci'rcuit including the movable coil, means vto. closel the circutlupon the occurrence of a faulttlinl the Weaving operation of the loom, and therebyestablish a secondlmagnetic eld by current induced-in the. said. second electric coil whereupon the Vsaidsecondelectric coilmoves away from the'said single electric coil.

land meansl Vtocause-'the force transmitter `to move to force` transmitting position relatively to the actuator bymovement of thesaid` second K electric' coil.

motiomalsource of alternating current, a regucited to create van alternating magnetic fleld, a secondary coil in the magnetic ileld mounted-for movement relatively to the primary coil' andl normally adjacent tothe primary coil, anormally open electric circuit including the secondary coil, means to close the circuitwhen the loom is to be stopped, thereby establishing a second magnetic field by current induced in the secondary coil and causing relative motion between the coils, and means connecting the secondary coil to the force transmitter to move the latter to force transmitting position relatively to the members when the secondary coil moves relatively to the primary coil.

3. In a knock-01T mechanism for a loom stop motion, a source of alternating current, a regularly moving actuator member, a knock-ft member to be moved to stop the loom by a force derived from the actuator member, a force transmitter normally out of force transmitting position relatively to the members, a single magnetizing coil to create an alternating magnetic field of force by reason of connection to and energization by said source of alternating current, an induction coil normally open circuited and located in the magnetic field adjacent to the magnetizing coil and movable relatively thereto, means to short-circuit the induction coil when the loom is to be stopped and thereby allow to be established an induced magnetic field by the induction coil effective to move the latter with respect to the magnetizing coil, and means operated through and by motion of the induction coil to move the force transmitter into force transmitting relationship with respect to the members.

4. In a knock-olf mechanism for a loom stop motion, a source of alternating current, a regularly moving actuator member, a knock-off member to be moved to stop the loom by a force, derived from the actuator member, a force transmitter normally out of force transmitting position relatively to the members, a single coil to establish an alternating magnetic eld of force by reason of connection to and energization by said source of alternating current, a normally open induction coil in the eld of force and movable relatively to the latter, a normally raised warp drop wire, means to short circuit the induction coil when the drop Wire falls and thereby establish an induced magnetic field around the induction coil effective to move the latter with respect to the alternating eld, and means operated by motion of the induction coil to move the force transmitter to force transmitting position with respect to the members.

5. In a warp stop motion knock-off mechanism for a loom, a source of alternating current, a

regularly moving actuator member, a normally stationary knock-off member to be moved by a force derived from the actuator member to effect loom stoppage, a normally raised Warp drop wire, a single coil to create an alternating magnetic field of force by reason of connection to and energization by said source of alternating current, a normally open circuited coil located in the eld and movable relatively thereto, means to short circuit the coil when the drop wire falls and thereby establish by induction a magnetic iield around the coil effective to move the latter with respect to the first named magnetic field, and means controlled by motion of the' coil to transmit a force from the actuator member to the knock-off member when the coil moves to cause loom stoppage.

6. In a knock-oil' mechanism for a loom stop larly movingactuator member, a knock-olf member to be moved to,v stop the loom by aforce derivedfrom the actuator member, a force transmitterY normally out of force transmitting position relatively to, the member, a vsingle primary coil-toy create an alternating magnetic field of force 'byA reason ofv connection to yand energizationzlov'` saidgsource of alternating current, an inductioncoil in the field of force, a movable support for the induction coil, connections between the support and the force transmitter to hold the induction coil adjacent tothe magnetizing coil when the force transmitter is out ol force transmitting position, means to short-crcuit the induction coil when the loom is to be stopped and thereby allow to be established an induced magnetic field around the induction coil causing the latter to move away from the magnetizing coil, motion of the induction coil away from the magnetizing coil being effective through said connections to move the force transmitter into force transmitting relation with respect to the members.

7. In a knock-off mechanism for a loom stop motion, a source of alternating current, a regularly moving actuator member, a knock-off member to be moved to stop the loom by a force derived from the actuator member, a force transmitter normally out of force transmitting position relatively to the members, a single coil connected to and energized by the source of alternating current to establish an alternating magnetic field during loom operation, a second normally open circuited coil located in the field of the rst coil and capable of establishing a magnetic field induced by and opposed to the rst magnetic field when said second coil is close circuited and said second coil movable relatively to the rst magnetic eld, means to establish the second magnetic field when the loom is to be stopped by causing thesecond coil to be close circuited and thereby effect relative motion of the second coil with respect to the rst magnetic field, and mechanism controlled by said relative motion of the second coil to move the force transmitter into force transmitting relationship with respect to said member.

8. In a knock-olf mechanism for a loom stop motion, a source of alternating current, a regularly moving actuator, a knock-off lever to be rocked to stop the loom, a force transmitter normally out of force transmitting position relatively to the actuator and knock-01T lever, a stationary single coil connected to and normally energized by the source of alternating current to create an alternating magnetic field, a movable coil normally stationary in said magnetic field, a normally open circuit including the movable coil, means to close the circuit including the movable coil upon the occurrence of a fault in the Weaving operation of the loom and thereby induce a second magnetic field in the movable coil effective to move the latter away from the rst coil, and means operated by movement of the movable coil away from the stationary single .coil to cause the force transmitter to move to force transmitting position relatively to the actuator and lever to cause the actuator to move the Y lever.

9.`In a knock-off mechanism for a loom stop motion, a source of alternating current, a regularly moving actuator member, a knock-off member to be moved to stop the loom by a fiorce derived from the actuator member, a force transcause the inductioncoil toestablish an induced 10 magnetic eld opposed to the first magnetic field to effect 4movement| Aof the induction coil rela.- tively to the rst magnetic field, and means operated` by the induction coil when the latter is moved by the magnetic force of the opposed magnetic eld to move the force vtransmitter' into force transmitting relationship with respect to the members. Y

OSCAR. V. PAYNE. 

